Lifting jack



' l sept. 11, 192s. 1,684,180 i A. HOPKINS v v LIFTING JACK Filed April 9, 1927 2 sneet-sneet 1 LIFTING JACK Filed April 9, 1927 2 Sheets-Sheetl 2 [1V VENTOA Patented Sept. 11,v 1928.

UNITED- s'frA'rs j j 11,684,180 reinar orf-rice. 1

ARTHUR o. 4Hormivs,or Nanne, MICHIGAN, Asistencia To narrower. .STANDARD oon- '.PNY, OF MILES, MICHIGAN.

LIFTING anon.

Appueation fuednprii 9,

My present improvements relate 4to improvementslin lifting jacks of the type/shown in Letters Patent No. 1,559,098, dated Gotober 27, 1925.

The main obfgi provide improved actuating; means whereby 'the 'lifting member may be rapidly raised and lowered, at the same time one which has a large amount of power.

V further object is to provide an improved actuatingmeans which can be quickly reversed or adjusted for raising or lowering` the load.

Objects relating' to detailsand economies of construction andoperation ofthe inven tion will appear 'from the detailed descrip-A tion to follow.

l.The invention is defined andpointed out inthe claims.

A structure which is a preferred embodiment of my` invention is illustrated in the accompanying drawing, forming; a part of this specilication, in which: y .l

Fig'. 1 is a perspective view ofa lifting; jack embodying' the features of my invention, the actuating lever being shown in its down `or lowered position.

Fig. 2 isa perspective view with the actuating lever in raisedfpositi'on, the lifting" lever bene; in partially elevated position.

Fig. 3 is a Jfragmentary invertedhviewof the actuating` lever and certain parts directly associated therewith.l

' Fig. lis a fragmentary view partially in section on line 4.-1 of Fig'. 3. Y

Fig. 5 is a fragmentary view of certain of the parts shown in Fig'. 4, swungor adjusted to another position. Y i j 1n the drawing similar reference characters refer to similar parts throughout therseveral views. Y

Referring` to the drawings, I provide a frame consisting, in the 'embodiment illustrated, of side members l, l'connected by suitableV cross piecesr and provided with wheels 2mounted on the axle 3 land with caster wheels 4f. mounted brackets 5. Y j

The lifting lever 6 is mounted on the pivot 7 extending` between the side members of the frame. This lifting lever carries the head 8 which `is pivoted at the outer end of the lever dat 9, the lever being held in upright i position kbythe link 10 which is pivoted to the headat 11 and to the frame at 12 inV par- 'ect 'of this invention .is tov Aon laterally projectingv 1927.' semaine. leaais.

allel relation to the lever, therebyl holding thi: head in upright position during' the swing of the lifting' lever. o Y

lconnect a pair of racks 13 tothe lifting,l lever -by .means ofpivots 14, the` pivot M beine' arranged in spaced relation to the pivot 7. These levers are supported on rol-lerslii carried by a cross piece 16 on theframe. j The pinions 17 are supported bv the journals 18 to'coact with the racks. Between the pinions and connected thereto isv aratchet wheel 19. At each side of the ratchet wheel Y is a bearing 20v Lfor the forks 21 ofthe actuating lever, designated. generally by the n'uf meral 22. This actuating leveris provided with a cross bar or hand piece 23 at its outer end.- y v A. lifting' pawl 24 is mounted onthepivot 25 carried by the leverl .to coactw-ith .the

ratchet wheel, the pawl being urgedyielding vly into engagementwith the ratchet wheelby means of the spring 26, one end of which en gages the' arm 27 on the pawl and .the .other a support 28 provided 'thereforv on-the actuat# ing' lever. n l l Y A holding,` pawl 29 is pivoted on the framel at 30 to coact with the ratchet wheel, this holding'pawl being arranged at the rearyof Van the re-tchetl vwheeland provided with a-nkupf wa'rdly projecting pin or inn'er .31l to which the spring 32 is connected, thespring' acting to urge the` I ratchet.

pawl intov engagement withthe i In normal :lifting` operation,` the liftingl vpawl ratchets upon the ratchet wheel as the actuating` lever is oscillated, the holding pawl also ratcheting upon the teeth ofthe ratchet wheel to prevent` reverse rotation of the ratchet. j i,

To lower orreverse the jack, I pipviclea: reversing memberj which has arearwardly projecting inpger Scurved to'extenct overY one ofthe bearmgsjot the actuating' lever .in-v Y to .co-operating ,relation with the pin 35 on the pawl 29.` Thisreversing memberA is mounted for a combined reciprocating .and swinging movement, the reversing` member beine; 'slotted at 36 toene'agfethe bolt 37 and` lalso having' a slot 38 embracingr theipivot25, the slot 38 being` of Such dimensions .as to alf-' low a swinging as well as a reciprocating movement about the pivot bolt 37., y

At its rear end, the reversing member has a cam 39 vcoaetingwith pin 40 so` thatasgthe reversingv member 1s moved rearwardly, 1t is lll also given an Vupward swinging movement, the combined movement giving a quicker and longer lift to the holdingr pawl than would result from a mere reciprocatory movement.

The reversing rod 4l is provided with a grip 42 positioned so as to be grasped along I wi th the hand piece 23 of the actuating lever. At its outer end, this reversing rod 4l is provided with a cross piece 43, the cross piece beingpivoted to the rod at 44. The link y45 is connected to one end of this cross piece by the pivot 46, the other end of the link being connected to the lower end of the tripping lever 47.

This lever 47 is mounted on the pivot 25 and at its upper end is provided with a pin 48 engaging the slot 49 in the upwardly projecting part 5() of the reversing member. This connection permit-s of the reciprocating and swinging movement of the reversing member. The lifting pawl 24 is connected bythe link 5l which is connected to the cross bar bythe Vpivot 52 to the lifting pawl, the link 5l having a slot 53 therein engaging a pin 54 on the lifting pawl, allowing for a lost motion connection so that on the lifting movement of the jack, the pawl can ratchet or oscillate independently of the reversing -A spring 55 is connected to the lower end Vof the lever 47 and tothe lug 56 on the actuatwardly thereon and at the same time pulls on the reversing rod with the grip 42. As soon as the holding pawl is relieved of its load, the reversing member moves rearwardly and upwardly, disengaging the holding pawl from the ratchet wheel and allowing the ratchetwheel to turn in a reverse direction under the control of the actuating lever. When the actuating lever reaches. the end of 'its up-stroke, the reversing member is released and returned to its initial position by the spring 55, allowing the holding pawl to drop-into engaging position. The load is then shifted from the lifting pawl to the holding pawl, allowing the holding pawl to beretracted by a pullron the reversing rod. The pin on the holding pawlV prevents movement of the reversing member, thereby permitting the actuating lever to be swung down i for a second stroke.

and adaptations which I contemplate as itis believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus `described my invention, what claim as new and desire -to secure by Letters Patent, is: Y

1. In a lifting jack the combination of a l frame, a` lift-ing mem er pivotally mounted on said frame, a pair of rack bars pivotally connected to said lifting member in spaced rela-tion to its, pivot, pinions coacting with said rack bars journaled in said frame, a ratchet wheel disposed between and connected to saidpinions and having actuating lever bearings ait its sides, an actuating lever forked to embrace said ratchet wheel and pivotally mounted on said bearings at the sides thereof, aspring actuated lifting Apawl pivotally mounted on said actuating lever to coact with said ratchet wheel, a spring actuated holding pawl pivotally mounted on said frame at the rear of'said ratchet wheel to coact therewith, a reversing member mounted on said actuating lever for reciprocating and swinging movement andhaving a curved ngercoacting with said holding pawl, said reversing member being'provided with a cam and said lever witha coacting pin whereby a swinging movement fis imparted tothe reversing member as it is reciprocated, a reversing rodV mountedon said actuating lever, a crossbar pivotally connected to said rod, a link connected to one end of said cross bar and having a pin and slot connection with said lifting pawl, a reversing member lever lever' and` havinga pin and slot connection with said reversing member, aV link connecting the opposite end of said cross bar with said reversing member lever, and a'return spring'connected to said reversing member lever. p

2. In a lifting jack, the combination of a frame, a lifting member' pivotally mounted on said frame, a pair of rack bars pivotally connected to said lifting member inspacedA relation to its pivot, pinions coacting with said rack bars journaled insaid frame, a ratchet Wheeldisposed between and connected to saidpinions and having actuating lever bearings at its sides, In actuating lever forked to embracesaid ratchet wheel and ivotally mounted on said bearings atthe `sides thereof, a spring actuatedlifting pawl pivotally mounted on said actuating lever tocoact with said ratchet wheel, axspring actupivotally mounted on said actuating,

ated'holding pawl pivotally mounted on said frame at the rear of said ratchetwheel to coact therewith, a reversing member mounted Y on said actuating lever for reciprocating andl swinging movement and having a curved finlasA ger coacting with said holdingfpawl, said reversing member being provided with acam and said lever with-a coacting pin whereby inserto reversing member.v

,3. In a lifting ack, thecombination of a frame, a lifting 'member pivotally vmounted onV said frame,y apair'of rack bars pivotally connected to saidlifting member in. spaced relation to its pivot, pinions` coacting With said rackibars' journaled yintsaid frame, a ratchet .Lversing member mounted on said actuating' Wheel disposed between .and connected to said pinions and having actuatingleve'rbearings atits sides,an actuating lever forked to embrace ysaid ratchet Wheel and pi-votally mountedon said bearings atthe sides thereof, :spring .actuated lifting pawl pivotally mounted onfsaidactuating lever vto coact with saidratchet Wheeha spring actuated holding pawl pivotal-lyv mounted on said frame to coactiwithsaid ratchet Wheel",l a Areversing member mounted on said actuating lever to coact with said hold-ing r',ipavvl, .a reversing rod mounted `on said .actuating lever, .a cross bar pivotally connected .to said rod, a link connected to one `end o-fsaidcrossbar and having a pin and .slot connection with said .lifting paivl, a reversing 'member lever pivotally mounted on ,said .actuating lever kand .having a pin and slot connection Wfithzsaid reversing `member, a link connecting the opposite end of :said cross bar With said reversing member lever, and a return .springiconnected 'toV saidreversingmember lever.

v4L. Ina lifting jack, kthe l.combination of .a

Vframe, .a lifting member pivotallyinounted on said'frame, a pair of .rack bars pivotally. connected kto .said lifting :member in spaced relation-to itspivot, pinions coacting With said rack bars journaled in said. frame, la ratchet Wheeldisposel-between and connected to said pin-.ions and having vactuating lever bearings at vits sides, an actuating Y lever forkedto embrace said ratchet Wheel and pivotally mounted on said bearings .at-the sides thereof, a spring actuated lifting paWl pivotallymounted on saidactuating lever to coact with said ratchet Wheel, a spring actuated holding pavvl pivotally mounted onk said frame to coact With said ratchetvvheel, .a releverto 4coact With said 'holding paivl, a reversing rod mounted on said actuatinglever, a cross barpivotally connected to said rod, a link connected to one end of said cross bar and having a pin and slot connection with said lifting pavvl, operating connections for the other end of said cross bar to saidv reversing member, and a return spring for said reversing member.

. 5. in uiting jack, uit combination .of a frame, .alifting :member pivotal-ly mount ed lonsaid frame, va rack bar pivotally con nected` to fsaidlifting member` in lspaced reliationto its pivot, a pinioncoacting-vvith said rack bar, a ratchet yWheel connected to said pinion, an actuating lever, a spring actuated lifting pai'vil pivotaliy nfiounted 1onsaidf ac tuating lever to vcoact ivi-th saidratclietwheel,

a 'spring actuated holding 'pa-wvl 'pivotally .mounted onl ysaid frame at 4the' rearl `of said ratchet Wheel to `co'act there-With, a reversing membermounted on saidractuating lever for reciprocating and swinging"movementI and Vhaving a curved finger coae'ting With said holdingpaivl, said reversing member being provided Witha cani vand said lever wvithafco'- acting .pin whereby a swinging movement is imparted to the reversing .member as `itis reciprocated, ya reversing rod. mounted on said actuatingl-ever, a cross-.bar piimtall'I conn nected to said rod, a link connected togen-eend of .said Vcross :bar andyhaving a pin `and' slot connection with said lifting palwl, a trippingleverr lpivotallv mounted `on said actuating lever and having a pin and slot @connection With said reversing member, a link connecting the4 opposite endzof saidicro'ss fbar with said tripping lever, and a return spring connected `tosai'd tripping lever.

y6. Ina lifting jack, Vthe combination of a frame, a lifting member lpivotal-lymounted` on said frame, a rack ,bar pivotally @connected to said lifting memberv in spaced relation to its pivot, a pinioncoacting with saidrack bar, a

ratchet Wheel connectedto said pinion, an actuating lever, 'a :spring actuatinglifting paw] pivotally mounted onsaid actuating leverfto coact with said .ratchet Wheel, .a spring actuated holding pawl pivotally ymounted .on Asaid frame at ,the rearofsaid ratchet IWheel to 'coact therewith, ya `reversing member` .mounted on saidfactuatiaig lever for reciprocating yand ics svvmging movement and having-a curved d finger coacting with .said holding pawl, sai-d' reversing member ibeingprovidedrwith a cam f and said lever with a coacting, pin whereby a swinging movement is imparted to the reversing 'member as it is reciprocated,aureversing` rod -mounted onfsaid .actuating lever, `a

c'ross bar pivotally: connectedtosaidrod, a' link connected yto one end of. said 4cross bar and having .a vpin and slot .connection With said lifting pavvl, and operating connections for the other end of saidcrossbarfto said reversing member.

7. In a lifting jack, the lcombi-nation `of-al framea lifting meinberpivotally `mounted on said framea rack bar pivotally" connecti edv to said lifting member in'spaced relation` to its pivot, a pinion coacting With said rack bar,` a ratchet Wheel connectedto.. said pinion, an actuating lever, a spring actuated lifting pavvlpivotally mounted on said actuating lever to coact with said ratchet Wheeh l mounte nected to said rod, alink connected toone end of said cross bar and having a pin` and slot connection with said lifting pawl, a tripping lever pivotally mounted on said actuating lever and having a pin and slot connection with said reversing member, a link connecting the opposite end of said cross bar with said trlpping lever,and a returnl spring connected to said tripping lever.

Y 3.4 In a lifting jack, the combination of a frame, a lifting member pivotally mounted on said frame, a rack bar pivotally connected to saidlifting member in spaced relationto its pivot, a pinion coacting With said rack bar, a ratchet wheel connected to said pinion, an actuating lever, a spring actuated lifting pawl pivotally mounted on said actuating lever` to coact `With said ratchet Wheel, a spring actuated, holding pawl `pivotally mounted on said lframe to coact with said ratchet-Wheel, a reversing member mounted on said `actuating lever to coact With said holding pavvl, a reversing rod mounted on said actuating lever, a cross bar pivotally connected to said rod,a link connected to one end of said cross bar and having a pin and slot connection with said lifting pawl, and operating connections for the other'end of said cross bar to said reversing member. 4

9. In a lifting jack, the combination of a frame, a lifting member, a rack bar operatively associated vvith said lifting member, a pinion coacting with said rackbar, a ratchet Wheel connected to said pinion, an actuating lever, a lifting pawl pivotall)7 mounted on said actuating lever to coact with said ratchet wheel, a holding pawl pivotally mounted on said frame to coact with Vsaid ratchet Wheel, a reversing member mounted on said actuating lever for reciprocating and swinging movement to coact wlth said holdingpawl, a reversing rod slidably mounted on said actuating lever, a spring acting to hold saidreversing member normally in inoperative position, and operating Vconnections for for said reversing rod and liftingpawl and said reversing rod` and reversing member whereby the paivls are alternately disengaged bythe actuation of said reversing rod, saidV lifting paivl having a lost motion connection to said reversing rod.

10. In a lifting jack, the combination of a frame,ga lifting member, a rack bar operreversing ro on said actuating leverto coact with said f' ratchet Wheel, a holding pawl pivotally mounted on said frame tocoact with said ratchet wheel, a reversing member mounted on said actuating lever to coact with said holding pawl, a reversing rod slidably mounted on said actuating"lever,a'spring acting to hold said reversing member Vnormallyin inoperative position, and operatin connections for said reversing rod and li ing pawl and said reversing rod and reversing member Whereb the pawls are alternately diseneased versin rod. d y, l

11. n a lifting jack, the combination` of a frame, a lifting member, a ratchet wheel operatively connected to said lifting member, an actuating lever, a lifting pawl pivotall mounted on said actuatin lever to coact wit said ratchetwheel, a hol ing pawl'pivotally. mounted on said frame to coact with saidV ratchet wheel, a reversing member mounted on said actuating lever for. reciprocating and swinging movement to coactwith said holding pawl, a reversing rod slidably mounted on said actuating lever, a spring acting to hold said reversing member. normally in inoperative position, and operating connections for said reversing rod and liftingpawl and said reversing rod and reversin isengaged by successive actuations of said reversing rod, vsaid lifting pawl having a lost to said reversing rod. y

12. In a lifting jack, the combination of a frame, a lifting member, a ratchet Vvvheel operatively` connected to 'said litin Imember, an actuating lever, a lifting paw "pivotally mounted on said actuating lever to coact with said ratchet wheel, a holding pawl pivotally mounted on said frame to coact with' said ratchet Wheel, a reversing member mounted on said actuating lever to coactwith said holdingV pawl, a reversingrod slidably mounted on sa1d actuating lever, a spring acting to hold said reversing memberinormally in inoperative position, and operating connections for said reversing rod and lifting" pawl and said reversingrod and reversing member whereby the pawls are alternately disengaged b successive actuations of` said motion connection y successive actuations ofsaid re- Y In Witness whereof I have hereunto set hand.

ARTHUR lo. HOPKINS. ,Y l 

